Materials Literature
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: We have observed that a slight crystal tilt away from the zone axis paradoxically decreases the dynamical extinction length, as if the electron-crystal interaction increases. This effect disappears at larger tilt angles. Using the simplified channeling theory, this behavior is explained.
The thermonuclear burn-up in deuterium - tritium (DT) mixtures with various D: T ratios is considered. It is shown that the use of small amounts of tritium simplifies the thermonuclear burn-up in the dense deuterium significantly. The general dependence of the critical burn-up parameter upon the D: T ratio, temperatur…
Selection of suitable sewing needle is one of the most important parameters for ensuring an effective and fault‐free sewing process. This task requires good knowledge of basic characteristics of a sewing needle, i.e. needle type, point shape and needle fineness. Also good knowledge of sewing materials is required. The…
The most economical way of protecting pipelines is through the application of organic coatings and wrappings. To make the protection foolproof at holidays and pores, cathodic protection is also applied. At coating holidays, the pipelines act as the cathode generating hydroxyl ion and hydrogen electrochemically. Extens…
High purity (GeS2)8−x (Sb2S3)20(NdCl3)x x=0, 0.01, 0.1, 0.5, glasses were prepared and their optical properties determined. The Ge-Sb-S system dissolves up to 0.5 mol.% of NdCl3 and still forms stable glasses. The structure of these glasses is formed by interconnected GeS4 tetrahedra and SbS3 pyramids as it follows fr…
Macroporous materials with highly uniform pores in the range 50 nm to 20 μm and of any desired porosity up to 90% can be produced using the method introduced here—emulsion templating. The Figure shows an extremely porous poly(acrylamide) gel, one of the many types of materials that can be synthesized using this versat…
Abstract The reactivity of limestone with sulphur dioxide has been evaluated during conditions similar to those existing in a fluidized bed combustor using a fixed‐bed quartz reactor. The reactivity of up to 11 particle sizes of 2 limestones were evaluated, and an exponential decay function was found to best describe…
We studied the orientation of nematic liquid crystals when they were being filled into cells by capillary action. We found that, in the flow front, the liquid crystal was always aligned along the flow direction. Far behind the flow front, the orientation of the liquid crystal depended on the anchoring direction of the…
Abstract Bis(hexafluoroacetylacetonato)copper(II) Cu(hfac)2(=M) reacts with 5-bromo-1,3-phenylenebis(N-tert-butylaminoxyl) 1 to yield a complex formula [M3·12]. The X-ray crystal structure shows that it crystallizes in the space group P1, with a = 12.469(2) Å, b = 15.278(2) Å, c = 11.602(2) Å, α = 104.59(1)°, β = 111.…
IFO is a newly developed computer program which transforms experimental structure factors for disordered materials to atomic distribution functions by employing an image-reconstruction-type technique. The transformation is carried out through a Monte Carlo search for an atomic distribution function which is a smooth,…
Although EIS is widely applied as a technique for monitoring the degradation of polymeric coatings when exposed to acqueous environments, a rigourous theoretical framework has not yet been fully developed. In this paper a mathematical model relating the kinetics of moisture uptake to the changes in the dielectric prop…
Abstract After curing, phenol‐formaldehyde resins were post‐cured at 160°C, 230°C, and 300°C in air for several hours, and then those post‐cured samples were carbonized at 1000°C. The effect of post‐curing on the physical properties and microstructure of the carbonized phenolic resin is reported in this article. The p…
Maleated natural rubber was modified by introducing different contents of cinnamate groups, separated from the main chain by —(CH2)n— spacers (n = 2 to 6). Residual carboxylic acid groups were neutralized as Li, Na, and K-salts. The kinetic behavior of these materials towards ultraviolet-induced crosslinking reaction…
The formation of bauxite from a granitic protolith, at 25°C, has been simulated using a modified version of the 1DREACT software for one-dimensional reactive transport, which uses a kinetic approach to describe the mineral dissolution and precipitation reactions. The rate laws describing these reactions incorporate th…
Computational models for analyzing in-reactor behavior of metallic fuel pins in liquid-metal reactors under steady-state conditions are developed and implemented in the Metal fuel performance Analysis (computer) Code for Simulating the In-reactor behavior under Steady-state conditions (MACSIS). Sodium logging and cons…
The use of different clay minerals as support materials in anaerobic digestion has been studied. The support materials were evaluated in a batch microdigester and their effect on the digestion process was measured at the beginning of the process (startup) and at an intermediate point of the digestion process when the…
UV−visible spectroscopy and H NMR spectroscopy were used to investigate the kinetics and the mechanisms of the chemical imidization for low molecular weight model monoamic acid and bisamic acid. Acetic anhydride and pyridine were used as the dehydrating mixture. The reaction was found to proceed by simultaneous format…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTWholly Aromatic Polyimides Containing Pendent Amino and Cyano GroupsIm Sik Chung and Sang Youl KimView Author Information Center for Advanced Functional Polymers, Department of Chemistry, Korea Advanced Institute of Science and Technology, 373-1, Kusung-Dong, Yusung-Gu, Taejon,…
A new series of cyclotriphosphazenes bearing Schiff bases with different carbon number alkoxy end groups(HAICP) in the side chains were synthesized and their phase transitions and liquid crystallinity were studied using DSC measurements and polarizing microscope observations. We found a monotropic Sml phase for n = 3…
We report measurements of the specific heat ${C}_{p}(T)$ and of the thermal conductivities ${\ensuremath{\lambda}}^{p}(T)$ along the periodic direction and ${\ensuremath{\lambda}}^{q}(T)$ along a direction in the quasiperiodic plane for decagonal Al-Ni-Co at low temperatures. The coefficient $\ensuremath{\gamma}=0.63$…